Magneto for irregular ignition



anglef-Which in the ease of two planes is vley the Vnumber' ofcylinders.

:nnen vv'. Reservieren, er iniiv n. fr

or NEW renin To all whom t ymay Gomera:

Be it known'tha't l, Leon W, lflesnn'iinin a citizen of the UnitedStal-es'AS residing a" 106 Central Park West New Yorl City, in thecounty of New lork, Statue oi lil'eiv York, have invented certain newand use* ful Improvements in Magnetos for irregular Ignition; and l Cloherebj)7 declare the following to Vbe a fulhelear, and exactelesoription of lthe invention; such will enable otherssl-illedin theart te which :ippertains to Ineke and use the sanie.

The present invention relates to' inegnetoe of the sleeve type forigniting combustible mixtures `in ,internal combustion engines irregularintervals.7 that is at unequal angles of rotation.

Air plane engines are now made with 8 to 18 cylinders in V or fenarrangement with ythe two. or three planes of cylinders spaced apartdiiierently than the usuel 900 for 8 cylinders, 6091201 1.2 cylindersaor in general., is equal to 360 or '720 divided @ther airplane engineshave their cylinders arranged in one lor two circular series. ln soin-eel? such engines, the departure from the usuel spacing necessitatesignition at irregular intervals; for instance,v an engine at present inuse has 12 cylinders arrengecl .in tivo planes on a 450 V .and requiresignition ae o, 45, T5", 45, and so on, inns-innen as 'le explosionsoccur in Cylinders of 'the mvo planes alternately.

Furthermore, the large number of evlinders, or the high speed oi"rotatifl 'the engine7 or both, neoessitae such exc I.sively rapiclsparking that when e niegneie is useflit should produce more llrfinyClie nwe .sparks perrotation given by erriinary bipolar magneto,hee-euse the speed. el

magneto Would otherwise be too high.

The primary object of my invention. is te provide a magneto which meetsthe forewa-v ing requirements, and is, therefm'e,4 interne.t edl forvassociation with an iniernal bustion'engine of the v, Flauw9 cir othertype having many eylinrle 'hating at high speed, er lie-'th powerstrokes occur er, f* ancl ordinarily recurin? vals, that is extensies relectroniagnetic spari; plu@ .frente are produced ai the esi-tenen,

successively unequal but alternet.

.in eecerclanee with the ini/'enne ture is iixerl in a position elisnler(l from its neutral j )ositien7 *l t is'in ne, p uen rlisplacerlli'rointhe position at which ne ture poles are symmetrically disposed e iieldinteipolar epee so than in 't` displaced position, Lhe 't 4" armaturepeles angles from 'the 'trailing1 poles. Ey making these ne ,ual anglessuite stantially 'the saine asL the irregular intervals oi ignition, themagnetic linx iiowing from. the field magnet through. the gew eratingWinrling mounted on lie arrnaixure or otherwise, as iflesirerl, is thenaltered by the iagnei-io members of the sleeve; and by simultaneouslyaltering the circuii ei? the generating' Winrling by suitable means suchas the mechanical interrupter on n by ignition eur- .irregular intervals and may he distributed .to the eparli plugs in the cylinders of theengine by a elistributer having suitably arranged coritacts connected.te the electrodes th Preferably., the armature poles paf i lap theiielfl poles anrl'ilie spens el and the magneiic ineinhers ef the Qrelative extent that the reverse-l el tliroimli armature is coin `letcd.in a eoniparetiiv 'lull ei riL-tatir S l. have (lisse e-reil that?notwitheta.; f the displacement or" the ar neutral pesten and. theoverlap of the ipielcl armature po l fig nerateu f llista y yil to a jspeed in Lien er rotetion, anc!` 'that the -gtli of the field magnet isov erehy enel (loes not wea-lien more than ordina in he r prese tsection i rnein i' 'half 'the difference ltrailing tips of the-armatureand shown diagrammatically ing the mechanical interruptor and thedistributer .associated with the magneto; and Figs. 4l to 7 illustratethe position of the rotatable sleevev at the 'four successive ignitionperiods.

The magnetic circuit of the magneto includes a stationary permanentmagnet 1 with symmetrical poles 2 and an armature With symmetrical poles3 connected b y the cross bar l-f The armature is displaced from itsneutral position by an .angle equal tov between 'the adjacent irregularvintervals, lin this case by 22.50,- so that the trailing tips of theoarmature poles are separated from the ytrailing tips ofthe field polesbyangles of '67.50 and 112.50. ln general, the angulary separation ofthe l field poles is substantially equal to the irregular intervals offiring of the engine, multiplied by the' ratio of the magneto speed ltothe engine crank shaft speed, or, in this case, to i150 times 15, and 75times 19g, respectively.

' Themagnetic sleeve has tivo iron members 5 vmagnetically separated'from each other and held in position by the brass end plates 6, 7. Thesemembers have a like .span of about 95 and are arranged to simultane-.ously bridge the field interpolar spaces and to later simultaneouslybridge the armature interpolar spaces, each ofivhich is substantially90o in angular extent. 1 v- The 'shafts 8, 9 of the sleeve are supportedin ball bearings 10, 11, carried by they supporting members 12, 13 whichare secured to the base plate of a magneto.. The shafts 14, 15 of 'theyarmature are mounted .in ball bearings .16,l 17 carried in enlargedrecesses of the two shafts of the sleeve. The shaft 1a extends throughand beyond the hollow shaft 8 and carries a collar 18 fast with it andwith stationary member i9 to secure the armature against rotation.

The magnetic sleeve' is rotated in its bear-- ings by the size to bedriven from the crank shaft of the engine at the required speed. ratio.As in Fig. one terminal. of the primary-turns 21 of thev generatingWinding is conneotedxto one terminal of the secondary turns 22 of thegenerating Winding `and thence 'to the stationary insulated element 23of themechanical interrupter. The other terminal of the primary of thesecondary turns is grounded, While the other terminal turns is connectedto the rotatable brush 2e of the distributor, which is driven by thegea-rs 26, at the required speed of rotation, in this case at one-thirdthe speed of? the sleeve.

The lcam memb Jr of the mechanical interrupter is fast with the sleeveand has four cams 27 spaced apart 67.5", 112.50-, 67.5, and 112.50 todeliect the grounded, movable element of the mechanical interrnpter.

. periody of gear 2G, -Which-is ofproper the field poles by and therebyinterrupt the 'primary turns of the genera ing winding at the irregularintervals of ignition. at those intervals, the distrilniter brush 241engages the spark plug distributing contacts 9G which are corre--spondingly irregularly spaced to conduct K the ignition currents fromthegenerating Winding to the insulated .terminals of the spark plugs 30in the engine cylinders.

The position of the sleeve members at. the four irregular intervalsofignition is illustrated diagrammatically in Figs. el to 7. ln Fig.`el, the ltrailing of the sleeve are' leaving the trailing tips of thearmature poles 3, thereby substantially interrupting the magnetic flux`flowingthrough the cross bar 4l and therefore in the generating windingmounted thereon. Almost directly'after that moment the magnetic fluxl isestablished through the armature in the opposite direction, the fluxthus'being reversed through the armature in a small angle of rotationofthe sleeve. At 67.50 later in the rotation, the trailing tips 'of thesleeve members leave the trailing tips of the field poles 2, as showninV Fig. 5, and almostdirectly magneticliuX isestablished in theopposite direction through-the armature'. At 112.50 after the second.period ofignition, or 180O after the first7 the trailing tips of thesleeve members a again leave the trailing tips ot' the armature poles Q,as shown in Fig. 6; and at 67.50 later, or 18()O fromthe secondignition, those tips leave the trailing tips of the field poles, asshown in Fig. 7. At each of these ignition periods, viz., at

O, 67.5", 1800 and 247.59 from the position 'i of thesleeve shown inFig. 4, the mechanical interrupter opens the circuit of the primary.turns 'and the distributor brush engages -a spark plug distributingcontact to conduct to the spark plug connected thereto the ignitioncurrent then produced in the generating -Winding.

`Having thus 'described my invention what l claim is 1. In a, magnetofor ignition at irregular' intervals, 'a field magnet having poles, anarmature having poles partly overlapping the field poles, a magneticsleeve rotatable in the air gap between the field and armature poles,'agenerating Winding, and means for altering the circuit of the generatingWindl ing at theirregular intervals determined by the trailing vtips ofthe field and armature poles'.

2. In a magneto for ignition; at recurring irregular intervals, afieldmagnet having poles. an armature having polesoverlapping half theangular differu ence between the adjacent ones of saidl intervals, amagnetic sleeve rotatable in 'the air gap between the field and armaturepole-s, gemgerating Winding, and means for altertipscf thev members 5-after that moment, the.

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